It would technically be the fifth law.

Zeroth Law - A robot may not injure humanity or, through inaction, allow humanity to come to harm.

self.setEyeColor(self.isGood() ? 'blue' : 'red');

If they’re evil it presumably means they’re disobeying the first three laws… they may disobey the fourth law too to help cover their other crimes

Well, can’t argue that it’s not practical

I think it’s supposed to represent errors in the robots code like “I’m evil cuz i’m bugged”